[PATCHv7 9/9] ARM: dma-mapping: add support for IOMMU mapper

[Krishna Reddy]

> On Wed, Feb 29, 2012 at 04:04:22PM +0100, Marek Szyprowski wrote:
> > +static int arm_iommu_mmap_attrs(struct device *dev, struct
> vm_area_struct *vma,
> > +		    void *cpu_addr, dma_addr_t dma_addr, size_t size,
> > +		    struct dma_attrs *attrs)
> > +{
> > +	struct arm_vmregion *c;
> > +
> > +	vma->vm_page_prot = __get_dma_pgprot(attrs, vma-
> >vm_page_prot);
> > +	c = arm_vmregion_find(&consistent_head, (unsigned
> long)cpu_addr);
> 
> What protects this against other insertions/removals from the list?

arm_vmregion_find uses a spin_lock internally before accessing consistent_head.
 So, it is protected.


-KR

--nvpublic